switch os
case unix alias! lf !!ls -CF
default alias! lf !!dir/w

alias! pwd calc getcwd("!*")

alias! save {
 "Write this file, but only if it has been modified
 if modified
 then w!? !*
}

alias! ww {
 "Write this file, but if readonly then check it out first
 if readonly && "!?!%!*" == ""
 then !!co -l %
 then w!!
 else !%w!? !*
}

alias! man {
 "Display a man page in a new window
 local b report=0 nosaveregexp magic magicchar=^$.[* noignorecase
 let b = newbuffer()
 (=b) set bd=man
 (=b)r !!man !*
 try (=b)1 s/^Reformatting.*ait\.\.\.$//
 try (=b)% s/\\/\\\\/g
 try (=b)% s/_\(.\)*\(.\)/\\fI\2\\fR/g
 try (=b)% s/.\(.\)*\(.\)/\\fB\2\\fR/g
 try (=b)% s/\\fR\\fB//g
 try (=b)% s/\\fR\\fI//g
 (=b)1 i .nf
 (=b) set nomod nospell
 (=b)split
}

alias! howto {
 "Search Elvis' "How To" appendix.  ! makes it try harder.
 local magic magicchar=^$.[* noignorecase
 if "!?" == "!!"
 then split +/*!1.*!2.*!3.*!4 (elvispath("howto.html"))
 else split +/^<dt>.*!1.*!2.*!3.*!4 (elvispath("howto.html"))
}


alias! kwic {
 "Build a table showing instances of a word from the manual
 local d
 if "!^" == ""
 then error :kwic missing lhs
 let d=dirdir(elvispath("elvis.html"))
 eval split +"kwictweak !^" !!grep -i -n -w !\^ (d/"*.html")
}

alias! kwictweak {
 "Convert grep's output to a nice HTML table
 local ic report=0 magic magicchar=^$.[* noignorecase
 try %s/	/ /g
 try %s/ \{2,}/ /g
 try %s/<[^>]*>//g
 try %s/&[[:alnum:]]*;//g
 try v/\<!\^\>/d
 %s/^\([^:]*\):\([^:]*\):\(.*\)\<\(!\^\)\>\(.*\)$/\3<a href="\1?\2">\4<\/a\>\5/
 %s/^/                              /
 %s/^[^<]*\([^<]\{30}<.*>.\{0,30}\).*$/\1/
 1 i <h1>Instances of "!^" in Elvis' manual</h1><pre>
 $ a </pre>
 se bd=html mapmode=html nomod
 dis html
 1;/>\=!\^
}

if feature("proto")
then {
 alias! readDIR {
  "Implement a dir: protocol for reading directories

  "read the list of file names
  switch os
  case unix  r !ls !2*
  case win32 r !dir /b /a-d !*
  "What are the equivalent commands for OS/2 and whatever other OSes are valid?
  default    r !dir !*

  " if fbrowsetweak isn't aliased yet, then load it now
  if !alias("fbrowsetweak")
  then load sfb

  " convert the list to html
  fbrowsetweak !2*
 }
}

alias! text {
 "Like :tag but for any text in *.c or *.h
 local tagprg="grep -nsw '(quote(\"'\",$1))' *.[ch] /dev/null \| sed 's/^\\\\\\(.*\\\\\\):\\\\\\(.*\\\\\\):.*/!^	\\1	\\2/'"
 tag!? !*
}

alias! btext {
 "Like :browse but for any text in *.c or *.h
 local tagprg="grep -nsw '(quote(\"'\",$1))' *.[ch] /dev/null \| sed 's/^\\\\\\(.*\\\\\\):\\\\\\(.*\\\\\\):.*/!^	\\1	\\2/'"
 browse!! !*
}

if gui=="x11"
then {
 alias! courier {
  "Use Courier fonts of a given size (X11 only)
  if !isnumber(!(14)1)
  then error usage: courier [fontsize ["bold"]]
  set font="courier*!(14)1!2"
  let italicfont=font;"i"
  if "!2" != "bold"
   then let boldfont=font;"b"
 }
 alias! luxi {
  "Use Luxi mono fonts of a given size (X11 only)
  if !isnumber(!(14)1)
  then error usage: luxi [fontsize ["bold"]]
  set font="luxi mono*!(14)1!2"
  let italicfont=font;"i"
 }
 alias! andale {
  "Use Andale mono font for the main font, and Courier for italic (X11 only)
  if !isnumber(!(14)1)
  then error usage: andale [fontsize]
  set font="luxi mono*!(14)1" italicfont="courier*!(14)1i"
 }

 alias! fork {
  "Run a program in the background (X11 only)
  !! >/dev/null 2>&1 !* &
 }
}

if feature("array")
then {
  alias! wrapset {
    "Given a label and name of option containing a set, print it
    local l a e b
    eval let a = "(!$)"
    let b="!$* "
    let l = strlen(b)
    for i (1..a[,,0])
    do {
      let e = a[,,i]
      if i < a[,,0]
      then let e ;= ","
      if strlen(b e) >= columns
      then {
        calc b
        let b = "" << l
      }
      let b = b e
    }
    if strlen(b) > l
    then calc b
  }
} 

if feature("image")
then {
 alias! theme {
   "list themes, or load one
   local a="" i d f
   if "!1" == ""
   then {
     for i (1..elvispath[:,0])
     do {
       let d=elvispath[:,i]
       for f in (d/"themes"/"*.ex")
       do {
         if basename(f) != "*"
         then let a |= basename(f)
       }
     }
     if a == ""
     then error no themes
     else wrapset Themes: a
   }
   else {
     let f = elvispath("themes/!1.ex")
     if f != ""
     then safely source (f)
     else error the !1 theme isn't installed here
   }
 }

 alias! readTHEME {
   " download a "theme:name" URL
   local a="ftp://ftp.cs.pdx.edu/pub/elvis/themes_archive"
   local f nowrapscan magicchar="^$[*." magic noignorecase report=0 nolock
   set reol=text bufdisplay=normal
   "
   " Read the theme's files, in a single "*.thm" file
   if "!2" == "" || "!2" == "/" || dirext("!2") != ""
   then {
     if "!2" == "" || "!2" == "/"
     then let f=a/"index.html"
     else let f=a/"!2"
     r (f)
     if strlen("!2") < 2 || tolower(basename("!2")<<4) == ".htm"
     then {
       eval %s/index.html/(quote("/~", a))\/&/g
       eval %s/src="/&(quote("/~", a))\//g
       set bd=html mapmode=html
     }
     else set bd=hex
   }
   else {
     r (a)/!2.thm
     "ta !2.thm
     "
     " Make sure the user's themes directory exists
     let f=elvispath[:,1]
     if f[/,1] == "~"
     then let f = home / f[/,2...]
     if dirperm(f) != "directory"
     then eval !!mkdir "(f)"
     if dirperm(f/"themes") != "directory"
     then eval !!mkdir "(f/"themes")"
     if dirperm(f/"themes") != "directory"
     then fail could not create the (f/"themes") directory
     "
     " Extract the theme files
     %s?^BEGIN \([^.][^[:space:]$/\\!!~]*\)?+;/^END /-w!! (f/"themes"/"\1")?x
     "
     " Delete the data, but keep any introductory comments
     1;/^BEGIN /,$d
     "
     " The above steps are not considered to be modifications
     set nomod
     "
     " Load the theme
     theme !2
   }
 }

 alias! mktheme {
   " Create a new theme, in the current buffer
   local i p f="" magicname wrapscan report=0
   if "!1" == ""
   then error usage: mktheme name
   "
   " put the introductory text into the buffer
   %d
   i !1
   s/.*/\U&\E\n\nDescribe the theme here.  Include your name and any credits.\n/
   "
   " add the ex script for setting up the colors
   $a BEGIN !1.ex
   a try set textcursor=opaque
   eval a try set (scrollbgimage?"":"no")scrollbgimage
   eval a color normal (color("normal"))
   a if color("idle") != "like normal"
   eval a then color idle (color("idle"))
   if color("idle") == "like normal"
   then warning You should probably set the idle colors to something other than "like normal"
   for i in cursor selection bottom toolbar tool scrollbar scroll statusbar status 
   do {
     if color(i) == ""
     then error You need to set the (i) colors
     else eval a color (i) (color(i))
   }
   a END !1.ex
   "
   " add any image files
   %s/\S\+\.xpm/let f = f "&"/x
   for i (f)
   do {
     try 1;/^BEGIN $i/goto
     else {
       eval ("$")a BEGIN (i)
       if exists(i)
       then let p = i
       else let p = elvispath("themes"/i)
       "Note: The odd method of reading the image files is necessary due to the
       "fact that sometimes the last line is a comment without a \n terminator.
       eval r !! cat (p); echo
       $s/.*/END $i/
     }
   }
   "
   " leave the cursor on the line with the comment
   3
   "
   " rename the edit buffer.  This also displays the new name on the bottom row
   if filename != "!1.thm"
   then file !1.thm
 }
}

alias! copying split (elvispath("license.html"))

alias! fe features
alias! features {
 "Describe the configuration of this Elvis
 local i f l

 calc "Elvis version:     ";version

 set f="normal"
 for i in syntax hex html man tex
 do let f=f (feature(i) ? i)
 calc "Display modes:     ";f

 set f=""
 let f=f (feature("ftp") ? "ftp")
 let f=f (feature("http") ? "http")
 calc "Network protocols: ";(f ? f : "none")

 set f="" l="Other features:    "
 for i in alias array autocmd backtick browse cachedesc calc complete equaltilde fold g hlobject hlsearch image incsearch listchars litre lpr make mapdb misc mkexrc normal proto ram rcsid showtag smartargs spell split tags textobj v xft
 do {
  if feature(i)
  then {
   if strlen(l;f i) > columns-2
   then {
    calc l;f
    set l="                   " f="" 
   }
   let f=f i
  }
 }
 if f != ""
 then calc l;f
}

alias! customize {
 "Edit a personal copy of one of Elvis' configuration files
 local d o n f="!^"
 if f == ""
 then error :customize requires the name of a configuation file
 let o = elvispath(f)
 if o == ""
 then error "!^" is not a known configuration file
 if os=="msdos" || os=="os2" || os == "win32"
 then let d=$HOME/"dotelvis"
 else let d=$HOME/".elvis"
 if dirperm(d) == "new"
 then eval !mkdir "(d)"
 let n = d / f
 if exists(n)
 then e (n)
 else {
	e (o)
	(=o) file (n)
	(=n)se noro
 }
}

alias! left {
 "Move text to the left side of each line
 local report=0 magic magicchar=^$.[* noignorecase
 !%s/^\s*
 !%s/\s*$
}

alias! right {
 "Move text to the right side of each line
 local w report=0 magic magicchar=^$.[* noignorecase
 !%left
 try !%s/ \{2,}/ /g
 let w = (textwidth == 0) ? columns : textwidth
 eval !%s/.$/&("" << w)
 eval !%s/^\\\(.\\{(w)}\\\).*/\\1
 !%s/^\(.*[^ ]\)\( \+\)$/\2\1/
}

alias! center {
 "Move text to the center of each line
 local report=0 magic magicchar=^$.[* noignorecase
 !%right
 !%s/  / /g
}

alias! cfmt {
 "Adjust C or C++ comment block.  Omit the */ line from range.
 local report=0 nosaveregexp magic magicchar=^$.[* noignorecase
 if !< == !>
 then error you must invoke cfmt with a range of two or more lines
 !>a STOP!!
 try !%s/^\(\s*\)\/\/\s*/\1/
 then {
  "C++ comments, already removed the //
  !%!!fmt
  !<,/^STOP!!$/- s/^\s*/&\/\/ /
 }
 else {
  "C comments, still need to remove the /* or *
  !<s,^\s*\([/ ]\*\)\s*,let a="\1",x
  !%s,^\(\s*\)[/ ]\*\s*,\1,
  !%!!fmt
  eval !< s,^\\s*,&(a) ,
  try !<+,/^STOP!!$/- s,^\s*,& * ,
 }
 /^STOP!!$/d
}

alias! wascii {
 "Write formatted text as plain ASCII
 local lptype=dumb nolpheader lplines=0
 if "!*" == ""
 then error You must specify a file name
 !% lp!? !*
}

alias! lpd {
 "Print text using the current display mode
 local bufdisplay
 let bufdisplay=display
 !%lpr!? !*
}

if feature("fold")
then {
  alias! foldc {
    " Fold C functions and conditional code
    local l magic magicchar=^$.[* noignorecase
    let l = current("line")

    " This alias works around a bug -- The :g command gets confused by
    " the :fold command, apparently because it changes the definition of
    " `line' as the :g is running.  The work-around is to use :unfold
    " until all of the :g commands are finished, and then do :%fold! to
    " fold them.

    " #if and #else directives
    g/^\s*#\s*[ie][fl]/ {
      local t a z
      let t = quote("()$",line())
      let a = current("line");
      normal ^%
      eval (a),- unfold (t)
    }

    " function bodies
    if feature("showtag")
    then {
      g/^{/ {
	if current("tag")
	then .,/^}/ unfold { (current("tag")) }
	else .,/^}/ unfold { ... }
      }
    }
    else g/^{/,/^}/ unfold { ... }

    " now fold everything
    %fold!
    eval (l)
  }
}

alias! sperror {
  " Show the errors from a :make or :cc command, in a new window
  if !window("Elvis error list")
  then (Elvis error list)split
}

if feature("array")
then {
  alias! load {
    "list scripts, or load one
    local a="" i j k d f
    if "!1" == ""
    then {
      for i (1..elvispath[:,0])
      do {
	let d=elvispath[:,i]
	for f in (d/"scripts"/"*.ex")
	do {
	  if basename(f) != "*"
	  then let a |= basename(f)
	}
      }
      if a == ""
      then error no scripts
      else wrapset Scripts: a
    }
    else {
      let f = elvispath("scripts/!1.ex")
      if f != ""
      then source (f)
      else error the !1 script isn't installed here
    }
  }
}

alias! safer {
  safely source!! !*
}